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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

For an Isothermal process - Chemistry

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प्रश्न

For an Isothermal process

पर्याय

  • W = - Q

  • ∆U = W

  • ∆U = Q + W

  • ∆U = Q

MCQ

उत्तर

W = - Q

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First Law of Thermodynamics
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Chemical Thermodynamics - Multiple choice questions

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एससीईआरटी महाराष्ट्र Chemistry [English] 12 Standard HSC
पाठ 4 Chemical Thermodynamics
Multiple choice questions | Q 5

संबंधित प्रश्‍न

The internal energy of an ideal gas decreases by the same amount as the work done by the system.

(a) The process must be adiabatic.

b) The process must be isothermal.

(c) The process must be isobaric.

(d) The temperature must decrease.


The pressure of a gas changes linearly with volume from 10 kPa, 200 cc to 50 kPa, 50 cc. (a) Calculate the work done by the gas. (b) If no heat is supplied or extracted from the gas, what is the change in the internal energy of the gas?


Choose the correct option.

Which of the following is an example of the first law of thermodynamics?


A mixture of hydrogen and oxygen is enclosed in a rigid insulating cylinder. It is ignited by a spark. The temperature and pressure both increase considerably. Assume that the energy supplied by the spark is negligible, what conclusions may be drawn by application of the first law of thermodynamics?


A resistor held in running water carries electric current. Treat the resistor as the system

  1. Does heat flow into the resistor?
  2. Is there a flow of heat into the water?
  3. Is any work done?
  4. Assuming the state of resistance to remain unchanged, apply the first law of thermodynamics to this process.

Two moles of an ideal gas is expanded isothermally and reversibly at 300 K from 1 L to 10 L. The enthalpy change in kJ is ______.


A gas performs 0.320 kJ work on surrounding and absorbs 120 J of heat from the surrounding. Hence, change in internal energy is ______.


The process, in which no heat enters or leaves the system, is termed as ____________.


Based on first law of thermodynamics which of the following is correct.


In a given process for an ideal gas, dW = 0 and dQ < 0. Then for the gas ____________.


A sample of gas absorbs 4000 kJ of heat and surrounding does 2000 J of work on sample, what is the value of ΔU?


A system goes from P to Q by two different paths in the P-V diagram as shown in figure. Heat given to the system in path 1 is 1000 J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?


A cycle followed by an engine (made of one mole of perfect gas in a cylinder with a piston) is shown in figure.

A to B : volume constant
B to C : adiabatic
C to D : volume constant
D to A : adiabatic

VC = VD = 2VA = 2VB

  1. In which part of the cycle heat is supplied to the engine from outside?
  2. In which part of the cycle heat is being given to the surrounding by the engine?
  3. What is the work done by the engine in one cycle? Write your answer in term of PA, PB, VA.
  4. What is the efficiency of the engine?

(γ = `5/3` for the gas), (Cv = `3/2` R for one mole)


A cycle followed by an engine (made of one mole of an ideal gas in a cylinder with a piston) is shown in figure. Find heat exchanged by the engine, with the surroundings for each section of the cycle. (Cv = (3/2)R)

  1. AB : constant volume
  2. BC : constant pressure
  3. CD : adiabatic
  4. DA : constant pressure

The first law of thermodynamics is concerned with the conservation of ______.


Write the mathematical equation for the first law of thermodynamics for:

Isothermal process


An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90 W. How long it would take to increase the internal energy by 2.5 × 103 J?


A system is taken through a cyclic process represented by a circle as shown. The heat absorbed by the system is ______.

 


If one mole of monoatomic gas `(gamma=5/3)` is mixed with one mole of diatomic gas `(gamma=7/5)`, the value of γ for the mixture is ______.


The amount of work done in increasing the voltage across the plates of capacitor from 5 V to 10 V is W. The work done in increasing it from 10 V to 15 V will be ______.


An ideal gas (γ = 1.5) is expanded adiabatically. How many times has the gas had to be expanded to reduce the root mean square velocity of molecules two times?


An ideal gas having pressure p, volume V and temperature T undergoes a thermodynamic process in which dW = 0 and dQ < 0. Then, for the gas ______.


One mole of an ideal gas is initially kept in a cylinder with a movable frictionless and massless piston at pressure of 1.01MPa, and temperature 27°C. It is then expanded till its volume is doubled. How much work is done if the expansion is isobaric?


In an adiabatic process, W = ______.


In an adiabatic expansion of 2 moles of a gas, the initial pressure was 1.013 × 105 Pa, the initial volume was 22.4 L, the final pressure was 3.191 × 104 Pa and the final volume was 44.8 L. Find the work done by the gas on its surroundings. Taken `γ = 5/3`.


Calculate work done when 2 moles of ideal gas expands by 5 dm3 isothermally at pressure 1.2 bar.


What is an isothermal process?


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